iOS 12.4 (build 16G5056d) is an official Apple over-the-air update for the iPhone XS Max, released on 2019-06-24T17:17:24Z. The update package is 226.24 MB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 462182eb8bb0007d8783f39de95141f20f12654e.zip.